Calcium Silicate Boards

Calcium silicate board is an asbestos-free thermal insulation product that can withstand continuous high operating temperatures. It is a light weight, low thermal conductive, high strength, easy to install, reliable and durable product. Industrial grade piping and equipment insulation is often fabricated from calcium silicate. It is a white free-flowing powder obtained by reacting calcium oxide and silica. It has a low bulk density and high physical water absorption.


Calcium silicate board is an asbestos-free thermal insulation product that can withstand continuous high operating temperatures. It is a light weight, low thermal conductive, high strength, easy to install, reliable and durable product. Industrial grade piping and equipment insulation is often fabricated from calcium silicate. It is a white free-flowing powder obtained by reacting calcium oxide and silica. It has a low bulk density and high physical water absorption.

Calcium Silicate Boards are manufactured from a mixture of Portland cement, fine silica, special cellulose fibers and selected fillers to impart durability, toughness and moisture resistance. Calcium Silicate Sheet is then cured by an autoclaving process whereby the ingredients are reacted together under heated steam and high pressure.

The synthetic cement silicate binder provides exceptional dimensional stability and an unrivalled resistance to movement due to effects of moisture or heat. Calcium Silicate Board does not contain any ingredients or free alkali that could be dissolved by moisture or condensation. If exposed to moisture, the board will completely recover on drying out, with no permanent loss of strength.

Calcium silicate boards are used in Europe as a highly successful fireproofing material. High performance calcium silicate boards retain their excellent dimensional stability even in damp and humid conditions and can be installed at an early stage in the construction program, before wet trades are completed and the building is weather-tight. Most Calcium Silicate boards are classified as non-combustible according to EN 13501-1 (2007).

Calcium Silicate boards will not degrade with time and within normal applications, the life of the product is limited only by the durability of the supporting structure and materials used in fastening. Calcium Silicate Board will not rot or support fungal growth and is unaffected by sunlight or steam. Calcium Silicate boards are designed for use in applications, where impact resistance, fireproofing, waterproofing, sound adsorption and heat isolation are required.

Qualities of Calcium Silicate Insulation
  • Low bulk density,
  • Low thermal conductivity,
  • Good thermal resistance,
  • Fire-proof,
  • High strength,
  • Light weight,
  • Durable,
  • Easy to install,
  • Will not rot or support fungal growth,
  • Unaffected by sunlight,
  • Unaffected by steam,
  • Absorb sound,
  • Highly resistant to termites and attacks from other vermin.
Calcium Silicate Board applications
  • For external walls & ceilings,
  • For internal walls, partitions and ceilings,
  • As a sub-roof board, As the underlay board for floor and wall tiling,
  • For decorative applications, As a fire protective solution.

Here at InsulationShop.co you can find find various types and sizes of Calcium Silicate boards from leading manufacturers, such as Promat, Marley Eternit.



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6mm Masterboard Promat

6mm Masterboard Promat

2440x1220mm - 2.98m2  show quantity discountsDelivery Time: 1 - 2 days

£41.71 (£50.05 inc VAT)

£14.00/m2 (£16.80/m2 inc VAT)

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6mm Promat MASTERBOARD is made from calcium silicate reinforced with selected fibres and fillers. It is formulated without inorganic fibres and does not contain formaldehyde and is BBA approved (certificate No 90/2500). Promat MASTERBOARD is a versatile Class 0 building board suitable for use i..

£41.71 (£50.05 inc VAT)

£14.00/m2 (£16.80/m2 inc VAT)

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6mm Supalux Promat Fire Protection Board

6mm Supalux Promat Fire Protection Board

2440x1220mm - 2.98m2  show quantity discountsDelivery Time: 1 - 2 days

£69.93 (£83.92 inc VAT)

£23.47/m2 (£28.16/m2 inc VAT)

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Promat SUPALUX is a calcium silicate board reinforced with selected fibres and fillers. It is formulated without inorganic fibres, does not contain formaldehyde and can provide up to 240 minutes fire resistance. The board is non-combustible simple to work and fix, easy to decorate, resistant to the ..

£69.93 (£83.92 inc VAT)

£23.47/m2 (£28.16/m2 inc VAT)

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10mm Siniat BluClad Board

10mm Siniat BluClad Board

2400x1200mm - 2.88.m2  show quantity discountsDelivery Time: 2 - 4 days

Guide Price: £48.55 (£58.26 inc VAT)

£16.86/m2 (£20.23/m2 inc VAT)

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Siniat BluClad is a medium density fibre reinforced calcium silicate board which has been formulated without inorganic fibre. Available in a standard 10mm thickness, it is off-white in colour and has a smooth surface on the front face and textured on the reverse. The smooth face is for painting and ..

Guide Price: £48.55 (£58.26 inc VAT)

£16.86/m2 (£20.23/m2 inc VAT)

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12.7mm Promat Monolux 500 Fire Protection Board

12.7mm Promat Monolux 500 Fire Protection Board

2440x1220mm - 2.98m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £249.47 (£299.36 inc VAT)

£83.71/m2 (£100.45/m2 inc VAT)

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12.7mm Promat Monolux 500 Fire Protection Board is a rigid insulation material, designed to maintain stable strength and rigidity when exposed to max temperatures of 500C. No mineral fibres or asbestos is used in the manufacturing process. The board can be easily machined to close tolerances. Monolu..

Guide Price: £249.47 (£299.36 inc VAT)

£83.71/m2 (£100.45/m2 inc VAT)

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12.7mm Promat Monolux 800 Fire Protection Board

12.7mm Promat Monolux 800 Fire Protection Board

2440x1220mm - 2.98m2  Delivery Time: 3 - 4 days

Guide Price: £226.61 (£271.93 inc VAT)

£76.04/m2 (£91.25/m2 inc VAT)

12.7mm Promat Monolux 800 Fire Protection Board is a calcium silicate board, designed to maintain stable strength and rigidity when exposed to operating temperatures up to 800C and especially applicable in more arduous conditions where additional strength is required. No mineral fibres or asbestos a..

Guide Price: £226.61 (£271.93 inc VAT)

£76.04/m2 (£91.25/m2 inc VAT)

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12.5mm Siniat GTEC Weather Defence External Sheathing Board

12.5mm Siniat GTEC Weather Defence External Sheathing Board

2400x1200 - 2.88m2  Delivery Time: 2 - 4 days

Guide Price: £27.10 (£32.52 inc VAT)

£9.41/m2 (£11.29/m2 inc VAT)

12.5mm Siniat GTEC Weather Defence External Sheathing Board is a strong, highly moisture resistant and non combustible external sheathing board, faced with water repellent material for superior weather protection.  Thermal insulation can be installed within the frame, mechanically and/or a..

Guide Price: £27.10 (£32.52 inc VAT)

£9.41/m2 (£11.29/m2 inc VAT)

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20mm Promat PROMATECT L500 Calcium Silicate Board for Fire Resistant Ducts

20mm Promat PROMATECT L500 Calcium Silicate Board for Fire Resistant Ducts

2500x1200 - 3.0m2  Delivery Time: 1 - 2 days

20mm PROMATECT L500 is a non-combustible low density calcium silicate board, used for the construction of fire resistant ducts. The board is off-white in colour and has a smooth sanded surface on one face and a slightly honeycombed texture on the reverse face. It could be used for the construction o..

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9mm Kemwell MP-1000 Multipurpose Calcium Silicate Board - 2 Hour Fire Resistance

9mm Kemwell MP-1000 Multipurpose Calcium Silicate Board - 2 Hour Fire Resistance

2400x1200 - 2.88m2  Delivery Time: 3 - 4 days

Guide Price: £36.80 (£44.16 inc VAT)

£12.78/m2 (£15.34/m2 inc VAT)

9mm Kemwell MP-1000 is a strong, lightweight, versatile, Class 0, multipurpose building board suitable for use in a wide range of internal partitions, ceilings for use in many fire applications. The board is off-white in colour and has a smooth finish on one side with a sanded reverse face. Kemwell ..

Guide Price: £36.80 (£44.16 inc VAT)

£12.78/m2 (£15.34/m2 inc VAT)

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other thicknesses
12mm Promat PROMAFOUR Non-Combustible Fire Resistant Board - 1250x1250mm

12mm Promat PROMAFOUR Non-Combustible Fire Resistant Board - 1250x1250mm

1250x1250mm - 1.56m2  Delivery Time: 1 - 2 days

12mm Promat PROMAFOUR board is a 1250x1250mm strong, lightweight, non-combustible cement bonded calcium silicate based insulation board without inorganic fibres and do not contain formaldehyde. It can withstand high temperatures of up to 1000C and suitable as a wall lining surrounding high temperatu..

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